HELP. I have never ever played a double bass. Maybe just fool around, but not to play in a gig. I'm replacing a guy who can't make it for a wedding gig tomorow. It'll be a duet with a piano. NOW, I've been playing e-bass profesionally for a long time, but never a stand up. Please help me with the crucial informations guys. Or else I'll be dead. Thumb position, left hand position, tips on intonation(played fretless before), what not to do on a D-bass that are usually done on an E-bass? DOs and DON'Ts. Thanks a million!!